Huawei H12-811_V1.0 - HCIA-Datacom V1.0 Exam

Detailed Explanation:The TCP protocol ensures reliable data transmission by using a three-way handshake to establish a connection and a four-way handshake to terminate it. This handshake process helps ensure that both parties are synchronized and agree on communication parameters before data transmission begins. Additionally, mechanisms such as sequence numbers and acknowledgments ensure that data is received correctly and in order .

Comprehensive Explanation: OSPF (Open Shortest Path First) is a link-state routing protocol. It builds a complete map of the network ' s topology using Link-State Advertisements (LSAs) and makes routing decisions based on this map. Protocols like Static and Direct are not dynamic routing protocols, while FTP is a file transfer protocol

Comprehensive and Detailed Explanation:

Spanning Tree Protocol (STP) prevents switching loops in networks with redundant links by:

Blocking certain links while still maintaining redundancy.

Preventing broadcast storms and MAC table instability.

Reactivating backup links if the primary link fails.

✅ Reference: HCIA-Datacom Switching Guide – STP Loop Prevention

In OSPF, the " Full " state signifies that the neighbor relationship has been fully established, with both routers synchronized and their LSDBs updated. This state is achieved after exchanging and acknowledging Link State Advertisements (LSAs) between the neighbors, marking the completion of OSPF adjacency​.

Comprehensive and Detailed Explanation:

The TTL field is 8 bits long, allowing values from 0 to 255 (A is correct).

The TTL prevents routing loops by discarding packets with TTL=0 (B is correct).

Each Layer 3 device (router) that forwards the packet decrements TTL by 1 (C is correct).

If TTL reaches zero, the router drops the packet and sends an ICMP Time Exceeded message.

✅ Reference: HCIA-Datacom Network Principles Guide – IP Packet Structure

Detailed Explanation:Wi-Fi 6 refers to the IEEE 802.11ax standard, which improves the efficiency, capacity, and performance of wireless networks, especially in dense environments​.

Comprehensive Explanation: Host A and Host B cannot communicate because they are in different subnets. Host A ' s IP address is 10.0.12.1/30, while Host B ' s IP address is 10.0.12.5/24. Since they are in different subnet ranges and there is no router in the diagram to perform inter-subnet routing, direct communication between them is not possible without a router to route traffic between the different subnets.

A floating static route is configured by assigning a higher preference value to the backup route. This ensures that the backup route (floating route) is used only when the primary route is unavailable. Lower preference values indicate higher priority​.